The present invention discloses a non-contact dynamic strain field measuring method and system for a rotating blade. The method includes the following steps: establishing a three-dimensional finite element model of a to-be-measured rotating blade, and extracting modal parameters of the three-dimensional finite element model; determining the number and axial mounting positions of blade tip timing sensors; constructing a conversion matrix of finite measuring point displacement and an overall strain field; and acquiring blade tip finite position displacement of the rotating blade based on the blade tip timing sensors, and acquiring, by a dynamic strain, dynamic strains of the rotating blade at any moment, on any position and in any direction based on modal processing of the conversion matrix.
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2. The method according to claim 1, wherein in the first step (S1), strains of each node of the finite element model of the rotating blade comprise six strain components in total, comprising three positive strains εx, εy, εz and three shearing strains γxy, γyz, γxz.
This invention relates to finite element analysis of rotating blades, particularly in capturing strain components for structural integrity assessment. The method involves analyzing a finite element model of a rotating blade by measuring six strain components at each node of the model. These components include three normal strains (εx, εy, εz) and three shear strains (γxy, γyz, γxz). The analysis helps evaluate stress distribution and deformation under operational conditions, addressing challenges in accurately modeling complex blade geometries and dynamic loads. By capturing all six strain components, the method provides a comprehensive understanding of material behavior, improving fatigue life prediction and failure prevention. This approach is particularly useful in aerospace, wind energy, and turbomachinery applications where blade performance and durability are critical. The technique enhances computational accuracy by accounting for multi-axial strain states, which are essential for high-fidelity simulations of rotating structures. The method integrates with existing finite element modeling workflows, offering a detailed strain analysis framework for engineers to optimize blade designs and ensure structural reliability.
4. The measuring system for implementing the method according to claim 3, wherein in the first step (S1), strains of each node of the finite element model of the rotating blade comprise six strain components in total, comprising three positive strains εx, εy, εz and three shearing strains γxy, γyz, γxz.
A measuring system for analyzing strains in a rotating blade using a finite element model. The system addresses the challenge of accurately measuring and interpreting complex strain distributions in rotating blades, which are critical for structural integrity and performance in applications such as wind turbines or aircraft propellers. The system captures six strain components at each node of the finite element model: three normal strains (εx, εy, εz) and three shear strains (γxy, γyz, γxz). These measurements are used to assess the blade's deformation under operational loads, enabling early detection of material fatigue or structural weaknesses. The system integrates these strain components into a comprehensive analysis framework, allowing for precise monitoring of stress distribution and structural health. By resolving all six strain components, the system provides a detailed understanding of the blade's mechanical behavior, supporting predictive maintenance and design optimization. The technology enhances reliability and safety in rotating machinery by enabling real-time or post-processing strain analysis with high fidelity.
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May 20, 2021
June 11, 2024
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